Natural Philosophy ...

aberration altitude apogee apparent diameter ascer ascertained astronomers axis calculated called centre circle comet consequently corresponding course declination deduced degree determined direction earth's surface ecliptic equal equator equinox excentricity fixed stars given greater greatest heavenly body heavens Hipparchus horizon hour angle inferior planet instance Jupiter Kepler known latitude latter length less longitude lunar mean anomaly measured meridian method moon moon's nearly node nutation obliquity observed orbit parallax parallel passing perigee perpendicular planet pole position precession proportion Ptolemy quantity radius refraction remarkable respect retrograde retrograde motion revolution revolve right angle right ascension rotation round the earth round the sun satellites seen side sidereal sine solar solstice South sphere spherical sun's superior planet supposed supposition Surya Siddhanta synodic period tables tance tion triangle true tude variation varies velocity whole zenith distance